Abstract
The movements of many survey points that had been arranged about in a lattice at intervals of 2-4m in a small-scale landslide were repeatedly surveyed by an electro-optical distance-meter. From the results of survey, the distribution and the changes of horizontal strain of the ground surface were obtained by the theory of two-dimensional finite homogeneous strain. Consequently, this method was proved very effective for the detection of local movements in a landslide and further for the acquirement of data on a forecast of a landslide and measures against it.
